100 Metres and Below The evolution of the ultra short wave
1934 - Frequency Changing From the Mullard 1934-35 Valve catalogue
1934 - Mullard 2 Volt Battery Valves From the Mullard 1934-35 Valve catalogue
1934 - Mullard AC Mains Valves From the Mullard 1934-35 Valve catalogue
1934 - Mullard Universal Valves (AC/DC) From the Mullard 1934-35 Valve catalogue
The ABC of Television A simple explanation from 1938
AC Voltage Stabiliser A Constant voltage source for test equipment
A Dynamic Mutual Conductance (gm) Analyser The Radio Constructor, June, 1956 plus a working version
A General Purpose EF50 Circuit B9G The Radio Constructor, October, 1954
A Magnetic Digital Storage System Electronic Engineering, July, 1949
A Practical CV172 Noise Generator The Radio Constructor, August, 1956
Amplifying Crystal The Transistor: New from Bell Labs. Wireless World, October 1948
Are High-Slope Valves Wanted?
Army No. 10 Set Microwave pulse-modulated multi-channel voice link. Pulse-Width Modulation the basics explained.
Aspects of Design Application notes from Mazda. AEI 1960
Automatic Receiver Production Details of the ECME system
Automatic Circuit Production Proposed improved system from 1956
Automatic Volume Control. Basics and the Wunderlich valve
Basic Introduction to the Valve From a beginners series in 1966
Basic Technical Aspects of Valves How a valve works
BBC Radio, Adverts and extracts from Volume 1 issue 2 of the Radio Times in October 1923.
BBC Engineering, 1922 Onward A history by Pat Leggatt. Published in 1982.
BBC Television A history of the first public service. Published in 1948.
Broadcasting Over the Mains. Published in 1941.
Cathode-Ray Amplifiers. Von Lieben's work
The Cathode Ray Microscope A 1939 article detailing the principles of operation.
The Cathode Ray Television A 1933 article and construction project for 30 line TV.
Characteristics and Distortion. Within a small signal pentode
Choke or Capacitor Input? Significance of the two systems in power supplies.
The Coherer. The mechanical RF detector
Cold Cathode Valve Basics
Colossus II lives again
Colour Television - J L Baird's 102 line demonstration
The Dawn of Broadcasting in the UK The earliest history of Radio Broadcasting
DC/AC Converter A sensitive method of measuring small DC voltages.
Deleting Hum from Audio Amplifiers Heating the first stage by RF
Eckersley's Baby Brookman's Park BBC Transmitter in 1929
Electron Multipliers An avalanche of electrons
Electronic Voltage regulators Simplified method of design, estimation of performance
Electrostatic Deflection Producing a TV raster in 1938
The Evolution of Our Photographs See how digital photography compares to film
Fantasound. Stereo for the film Fantasia
The First Airborne Radar. From a room full to a doorknob
The First All Valve Computer. The Colossus rebuild at The National Museum of Computing
Professor Sir John Ambrose Fleming
Pioneer. A short biography of Sir John Ambrose Fleming.
The Origin of the Valve. A few words from the inventor.
How I Invented the Thermionic Diode. Details from the inventor.
The First Kurhaus Radio-Concerts. Part of the history of Dutch broadcasting
First Steps in VHF Exploration. Design of a one valve super-regen receiver
Focusing Cathode Rays. An explanation of electron optics from 1954
Forward Projection in the Home. Converting a rear-projection TV Chassis
Four-Electrode Detectors. The space-charge (bi-grid) grid valve as a detector - from 1928
The Four-Electrode Valve. A one valve radio with a space-charge (bi-grid) grid valve
Frequency Changing with the Octode. Effects found on Short-Wave
The History of the UK Valve, 1904-1925 An excellent book - a 'must have'
The History of the UK Valve, 1926-1946 An excellent book
How Little Distortion can we Hear A mathematical analysis from 1957
How To Build a Two Valve Set A practical project from cigarette cards in 1929
How To Make a Valve Amplifier A practical project from cigarette cards in 1924
How To Make Your Own Wireless A practical project from cigarette cards in 1924
Klystrons and Microwave Triodes A PDF file of a 1946 book
Linear Saw-Tooth Oscillator Miller integrator and transitron oscillator
Locked Oscillator Discriminator The EH90 TV FM sound demodulator
The Lure of the Moving Coil In 1928 this was the new must have
Magnetophon Recorders Processes involved in manufacturing the tape
The Manufacture of Ebonite Materials and processes for making high-grade ebonite
Marconi the Pioneer Brief account of the early spark gap experiments
Metal Coated Valves Taken from Popular Wireless November 14, 1931.
Metals used in Valve Manufacture Taken from Vacuum Tubes by K Spangenberg (1948) 1001 .
The Miller Timebase Circuit Used with a transitron circuit to form a quality timebase
Mullard Contributions to Hearing Aids. From Mullard Outlook March, 1966.
The Mullard Valve Manufacturing Philosophy - Intrinsicality. From Mullard Outlook February, 1966.
Mullard Valve Testing - Factory and Service Department. From Mullard Outlook September, 1953 to January, 1954.
A New Circuit for Balancing the Characteristics of Pairs of Valves.
Obtaining High HT Voltages with Standard Transformers. Useful for triode PAs.
The Optics of Projection Television. Early 1950's Mullard system.
The Osram Miniature Valve Story. An extract from an Osram data book.
Osram Valves. The Early Days
Pin Connection aid from Mullard. A slide rule marketing aid and a way to identify unknown valves.
The PL36 in Pictures. We dissect a television line output valve.
Projection Television. Advantages of plastics for optical equipment.
Push-Pull. In 1928 a relatively new method of audio amplification in the UK.
Radiogramophonics. A 1928 series on audio reproduction.
Reaction Up-To-Date. A look again at an old technique in 1939.
Rectifiers. Not as simple as they seem.
Reliable Valves and the User. An essay on reliability, by E G Rowe of Brimar Valves.
Sealing of Glass to Other Materials. Taken from Vacuum Tubes by K Spangenberg (1948) 1001 .
Sinclair Launches Mini TV The 1983 small flat screen television
Single Valve Frequency Division Another application of the Transitron topology.
The Skin Effect A non mathematical explanation
Sound on Disc Manufacturing in 1938
Sound on Disc Vertical Cut discs in America - 1938
Squegging Oscillators Explaining their operation
Stabilisation and Smoothing with Thermionic Valves A better power supply for audio pre-amp or input stages
Stabilised Power Supplies: Part Two, Part Three & Appendix Designs by M G Scroggie, Wireless World, 1948
The Story of the Valve This makes a perfect introduction to the valve and its history
Super-Regenerative Receivers A re-assessment. Wireless World, June, 1946.
Tetrodes with Screen Feedback Further light on the Ultra-Linear circuit
The Touch of a Woman's Hand Making sub-miniature valves.
The Transitron Circuit Used with a Miller integrator to form a timebase or oscillator
Trans-Ocean Transmitters Water cooled valves for the Short Waves up to 30 MHz.
Transitron Oscillators Wide range and high frequency stability with untapped coils.
Transitron Oscillators A practical Design.
Travelling Wave Tube Amplifiers Theory and practice of these high gain microwave amplifiers
Television Progress Cathode-Ray Tube Systems - 1933
Television Reception on Band V An early look at receiving UHF signals on a domestic receiver
Ultra Linear Operation Reduced harmonic distortion in audio amplifiers
Valveholders A short article from 1930.
Valve Operated Smoothing Circuit The forerunner of the voltage stabiliser?
Valve Testers Basics of operation - 1942.
Visual Frequency Comparison A magic-eye circuit for Audio comparison.
Wireless Telephony. Marconiphone equipment from 1920's cigarette cards.
Ultra Linear Output Transformers Stability of ultra linear push-pull output stages at high frequencies